Mechanical cork aggregate remover



July 15, 1958 J. J. GOAD, JR 2,342,949

MECHANICAL CORK AGGREGATE REMOVER Filed Sept. 21, 1956 Baud Ea, 2.

JEEJE J 6040 .k.

INVENTOR.

Arro/v/vil United States MECHANICAL CORK AGGREGATE Removals Jesse J. Goad,Jr., Arvin, Calif. Application Septemher 2L-1956, Serial No. 611,288

4 Claims. sa ds This invention relates to rotary abrading tools and has particular utility in the shoe repairing art.

In half-soling a pair of shoes, one-half of the outer sole of a shoe is first removed, thus exposing a layer of cork aggregate which was placed between the inner and outer soles of a shoe in the manufacture of the latter. It is necessary, to properly apply the new halfsole, thatthis layer of aggregate be removed. The binder employed in the aggregate is of a thermoplastic character so that the aggregate is customarily liquifie d by the repair mariplacing a little alcohol or gasoline on this aggregate and setting fire thereto. The aggregate is then scraped from the shoe to prepare this for the next step in half-soling it. This is a messy and smelly process.

It is an object of the present invention to provide a simple means of mechanically removing the aforementioned aggregate from a shoe when half-soling the same which will obviate the necessity of recourse to the flame process.

Efforts have been made in the past to remove the cork aggregate above-mentioned by the use of rotary wire brushes. While .these have been successful in a measure, the brushes quickly become loaded with the aggregate which necessitates this'being burned from the brush which is another smelly job and which tends to deteriorate the wire in the brush for subsequent use.

It is another object of the invention to provide a rotary abrading tool bywhich the cork aggregate aforesaid may be readily removed from a shoe when half-soling the latter and which will not become loaded with the aggregate. p

further object ofthe invention is to provide such a rotary abrad'i'ng tool which will have a relatively long life and which is provided with teeth which may be readily replaced when these have been worn down in use.

The manner of accomplishing the foregoing objects as well as further objects and advantages will be made manifest in the following description taken in connection with the accompanying. drawings in' which:

Fig.1 is an axial elevationalview drawn to full scale of' a preferred embodiment of the invention.

Fig. 2 is a side elevation of Fig. 1.

Referring specifically to the drawings, the invention is there shown as emhodiedin' a rotary cork-aggregate abrading tool id which is adapted to be mounted on a shaft Kilt having a shoulder 12 so as to fit against said shoulder. The tool it) includes an annular hub 13 having a bore T14, which slidably receives the shaft ii, and a neck 15 of reduced diameter in which is provided a screw it: for securing the hub 13 on the shaft 11.

The hub 13 has a cylindrical outer surface 17 from which holes are bored inwardly into said hub on radial axes and to a uniform depth as shown in Fig. 1. The location of these holes determines the positions of cylindrical steel wire pins 19 which preferably have a drive fit with the holes 18 or may be secured in said holes in any other manner. The portions of the pins 19 which extend outwardly above the surface 17 form abrading 2,842,9dh Patented July 15, 1958 teeth 20. The holes 18 are so bored into the hub 13 that the teeth 25 are located in a plurality of series of teeth identified by the numerals 25, 26, 27, 28, 29 and 3G. The teeth 26 of each of the series 25-30 are six in number and are located with the axes of said teeth lying in the same radial plane. These planes are uniforrnly spaced apart axially approximately twice the diameter of one of the teeth 20.

The teeth 20 in series 26 are circumferentially offset from the teeth 20 of series 25 so that each tooth 26 of the series 26 is equally spaced circumferentially from adjacent teeth 2t) of series 25. That is, these teeth are spaced apart by angles of 30.

The teeth 29 of series 27 are olfset relative to the teeth 20 in series 26 in an anticlockwise direction indicated by the arrow 31 in Fig. 1 by an angular distance of 42.

The teeth 21B of radial series 28 are offset from the teeth 2t) in series 27 in an anti-clockwise direction by angles of 30.

The teeth 2% of radial series 29 are offset respectively from the teeth 2t} in series 23 in a counterclockwise direction by angles of 42.

The teeth 2% of radial series 30 are offset respectively from the teeth of radial series 29 in a counterclockwise direction by angles of 30.

This produces circumferentially spaced groups A and B of teeth 2t). There are three teeth 2%. in each such group which are staggered circumferentially relative to each other. Furthermore, the teeth 2:? of the groups A are in axially staggered relation with the teeth of the groups B.

In practice, the rotary abrader it is rotated at high speed in the order of 1700-2700 R. P. M. and a shoe S having a leather insole 35 with a layer of cork aggregate 36 adhering to the bottom face of said insole is pressed downwardly against the tips of the teeth Ztl of the rotating abrading tool it? as shown in Fig. 2. This causes the rapid abrading of the cork aggregate 36 so that the outer ends of teeth 2% come into direct contact with the inner sole 35. The shoe S is then moved about over the abrading tool it? so as to cause the engagement of the teeth 2%) with the aggregate 26 to completely remove this from the shoe.

While readily removing the cork aggregate, the abrader lit has only a nominal abrading action on the leather insole 35" so that the removal of the aggregate may be accomplished practically without damage to the insole.

The aggregate 36 has a binder which gives this a gummy consistency tending to make this adhere to the teeth 20. Any tendency of the aggregate to ball up on the teeth 20, however, produces lumps of aggregate which are flung off by the centrifugal force set up by rotation of the tool 1%. Thus, while the teeth 2% become coated with a thin layer of the binder of the agg egate 36, the spaces between the teeth generally remain free without any necessity for special attention being paid to cleaning the tool. Should a binder be encountered of such a character that this would tend to collect on the teeth 25 the wide spacing of the teeth would render it a simple matter to clean the binder therefrom.

The facility of the tool 10 above described for readily removing gummy cork aggregate from an inner sole of a shoe, without damaging the inner sole when coming in contact therewith and without becoming loaded with gummy material, is due to the distinctly novel features of this tool. These include (1) the relatively small over all diameter of the tool which in the illustrated embodiment is only three times the diameter of the shaft (that shown being the standard finisher shaft used on cobblers power equipment), and (2) the scattering of the teeth 20 about the hub of the tool so that these teeth have a relatively low density per square inch of the area occupied thereby as compared with abrading tools commonly employed as tire rasps. In the application drawings, which illustrate a preferred embodiment of the invention drawn to full scale, the tool 10 is shown as having thirty-six teeth 20 which are scattered over an area on the external surface of the hub 13 which is three inches in diameter and slightly less than one inch in axial length. The area occupied by the teeth 20 on the periphery 17 of the hub 13 is thus about 8.5 square inches. Dividing this into the thirty-six teeth it: gives 4.2 teeth per square inch of said area.

As can readily be seen by an inspection of Fig. 2 in the drawings, this very low density with which the peripheral face 17 of the hub 13 is provided with teeth 20, gives assurance that a ball of gummy aggregate which is removed by one of the teeth 20 from the shoe being cleaned will be subjected to the action of centrifugal force and flung from the tool 10 before it has a chance to contact an adjacent tooth 20. vents the accumulation of abraded material in the spaces between the teeth 20 and causes the tool 10 to be selfcleansing.

The ability of the tool 10 to remove cork aggregate 36 from the insole 35 without damage to the latter when the tool has eaten its way through the cork aggregate, is due to the fact that although the teeth 20 are scattered over the surface 17 of the hub 13 so as to have a very low density per square inch of said teeth as above noted, thus rendering the tool self-cleansing, the teeth are nevertheless scattered circumferentially over the surface 17 so that the teeth ends of circumferentially adjacent teeth are separated by circumferentially measured gaps not substantially in excess of one-half inch. Thus the flat end faces of teeth 20 comprise sufficiently closely spaced fragments of a cylindrical surface whereby these teeth ride freely over a leather insole 35 without substantial injury thereto after the tool has abraded away the cork aggregate from the insole.

The teeth 20 are preferably made of a mild steel, giving the ends of these a tendency, after a substantial period of use, to be worn ofi on the side presented to the aggregate 36. In such a case, the tool 10 may be removed from the shaft 11 and replaced thereon in reversed position from that shown in Fig. 2. This will cause sharpened end faces of the teeth 20 to be presented to the aggregate 36, thereby increasing the effectiveness of the teeth in their abrading action.

When the teeth 20 wear to a point where it is desirable to replace these with new teeth, this may readily be done by pulling the teeth 20 from the holes 18 and driving new teeth 20 in said holes.

This replacement is desirable when the teeth 20 have worn down to perhaps one-half the length they are shown as having in the drawings, and where the accumulations of cork aggregate building up on the teeth ends start coming in contact with the surface 17 of the hub 13 so as to adhere to the hub and start bridging in the space between the teeth. This of course results in the tool 10 starting to become loaded with the aggregate which renders it ineffective to function in accord- This preance with its mode of operation above described. As shown in the drawings, the teeth 20 are preferably about 7 inch in diameter and when new extend approximately one-half inch beyond the periphery 17 of the hub 13.

While it is preferable that the end faces of teeth 20 be normal to the axes of said teeth, in the use of the tool, these faces wear down thereby producing various shapes on the ends of the teeth. At all times the teeth 20 may, however, be accurately referred to as stub teeth.

While only a single preferred embodiment of the invention is disclosed herein, it is to be understood that this is susceptible to many modifications and changes without departing from the spirit of the invention or the scope of the appended claims.

The claims are:

l. A rotary tool for removing gummy cork-aggregate from a leather insole, said tool comprising: a cylindrical hub having means for mounting the hub on a shaft for high speed rotation of said hub; and a number of steel stub teeth the diameter of which is in the neighborhood of about one-eighth inch, said teeth being mounted in said hub to extend radially a uniform distance from the peripheral face of said hub and being about one-half inch in length to prevent gummy accumulations of aggregate on said teeth from building up around the outer ends of said teeth to an extent that it bridges the space between adjacent teeth, said teeth being scattered over the hub area occupied thereby with a density in the neighborhood of about five teeth per square inch of said area.

2. A combination as in claim 1 in which the maximum outside diameter of said tool is approximately four inches.

3. A combination as in claim 1 in which the ends of circumferentially adjacent teeth are separated by circumferentially measured gaps not substantially in excess of one-half inch, whereby the end faces of said teeth comprise portions of a cylindrical surface which are sufficiently closely spaced circumferentially to ride freely over a leather insole without substantial injury thereto after removing cork-aggregate from said insole.

4. A rotary tool for removing gummy cork-aggregate from a leather insole, said tool comprising: a cylindrical metal hub having means for mounting the same on a shaft for rotation about its axis at high speed; and a multiplicity of approximately cylindrical steel stub teeth mounted in said hub to extend radially from the peripheral face thereof, and having a uniform length in the neighborhood of about one-half inch, said teeth being scattered over the area of said surface occupied by said teeth with a density in the neighborhood of about five teeth per square inch of said area.

References Cited in the file of this patent UNITED STATES PATENTS 1,347,299 Smith et a1 July 20, 1920 1,776,042 Radburne Sept. 16, 1930 1,832,509 Scott -'Nov. 17, 1931 2,545,392 Stuckler March 13, 1951 FOREIGN PATENTS 432,408 Germany Aug. 6, 1926 

